NMMA: A nuclearphysics and multimessenger astrophysics framework to analyze binary neutron star mergers
Abstract
The multimessenger detection of the gravitationalwave signal GW170817, the corresponding kilonova AT2017gfo and the short gammaray burst GRB170817A, as well as the observed afterglow has delivered a scientific breakthrough. For an accurate interpretation of all these different messengers, one requires robust theoretical models that describe the emitted gravitationalwave, the electromagnetic emission, and dense matter reliably. In addition, one needs efficient and accurate computational tools to ensure a correct crosscorrelation between the models and the observational data. For this purpose, we have developed the NMMA (Nuclearphysics and MultiMessenger Astrophysics) framework. The code allows incorporation of nuclearphysics constraints at low densities as well as Xray and radio observations of isolated neutron stars. It also enables us to classify electromagnetic observations, e.g., to distinguish between supernovae and kilonovae. In previous works, the NMMA code has allowed us to constrain the equation of state of supranuclear dense matter, to measure the Hubble constant, and to compare densematter physics probed in neutronstar mergers and in heavyion collisions. The extension of the NMMA code presented here is the first attempt of analysing the gravitationalwave signal, the kilonovae, and the GRB afterglow simultaneously, which reduces the uncertainty of our constraints. Incorporating all available information, we estimate the radius of a 1.4 solar mass neutron star to be $R=11.98^{+0.35}_{0.40}$ km.
 Publication:

arXiv eprints
 Pub Date:
 May 2022
 DOI:
 10.48550/arXiv.2205.08513
 arXiv:
 arXiv:2205.08513
 Bibcode:
 2022arXiv220508513P
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 Nuclear Theory
 EPrint:
 code available at https://github.com/nuclearmultimessengerastronomy